I want to save the image with a specific coordinate. Well, for example, x1: 5, y1: 6, x2: 10, y2: 11; I know how to do this in python, but this is nodejs, and officially nodejs does not support opencv, so I use https://github.com/peterbraden/node-opencv/tree/cfc96ba0af8c13d017d9c72f2c61ec968f1c15fb

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